Novel strategy for flexible and super-hydrophobic SERS substrate fabricated by deposited gold nanoislands on organic semiconductor nanostructures for bio-detection

Tseng, Zi-Ling ¹Liu, Chih-Yi ²Kuan, Tsai-Yu ³Jeng, Ru-Jong ⁴Yang, Ming-Chien ¹Wang, Yuh-Lin ²Liu, Ting-Yu ³Wang, Kuan-Syun⁴

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作者信息

1. Natl Taiwan Univ Sci & Technol
2. Acad Sin
3. Ming Chi Univ Technol
4. Natl Taiwan Univ
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Abstract

A new flexible, super-hydrophobic, and highly sensitive polydimethylsiloxane (PDMS) based-substrate would be developed for surface-enhanced Raman spectroscopy (SERS) detection. PDMS substrate is modified by nitrogen plasma and then deposited the organic conjugated molecules (alpha, omega-diperfluorohexylquaterthiophene, DFH-4T) films various thickness of Au nanoislands. The perfluorohexyl (-n-C6F13) chain of DFH-4T displays the advantages of high volatility and low vapor deposition temperature and can form a super-hydrophobic ivy-like nanostructure. After depositing the Au nanoislands on DFH-4T, the vertically arranged Au-DFH-4T nanostructure combined provides a tip-focusing effect and generates a very high electromagnetic field to enhance the Raman signal. Benefiting from the hydrophobic ivy-like nanostructure (maximum contact angle: similar to 146(o)) of Au@DFH-4T nanostructure, the hydrophobic molecule (vitamin D3, cholecalciferol) can be measured at ultralow concentration (10(-10) M). Moreover, the flexible SERS sensor exhibited acceptable efficiency and durability after 100 cycles bending tests. SERS intensity would increase similar to 1.6 time at 0.35 cm bending radius. This facile and efficient detection technique for meeting the increased demands for bio-detection, especially for hydrophobic biomolecules.

Key words

Surface-enhanced Raman spectroscopy (SERS)/detection/Evaporation method/Organic conjugated molecules/Flexible substrates/MOLECULAR-DETECTION/ARRAYS/SURFACE/NANOPARTICLES/MICRO/FILMS

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出版年

2022

Surface & Coatings Technology

ISTP

ISSN：0257-8972

被引量5

参考文献量24

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